Grease-gun



J. G. MACGREGOR.

GREASE GUN. APPLICAHUN mw sumas; 1919.

1,340,726. Patented May 18, 1920.

5 nvm/Lto a M 3 3513 v tom/w13 Mja mm UNITED STATES PATENT OFFICE.

GREASE-GUN.

Specification of Letters Patent.

Patented May 18, 1920.

Application led September 29, 1919. Serial No. 327,115.

prise a receptacle adapted to hold grease, or

other material of a pasty or semi-solid nature, and are provided with ejecting means whereby the material may be forced from the receptacle as desired, the present device being an improvement on one disclosed in a previous patent issued to me on August 13, 1918, under No. 1,275,455.

The present invention has for an object to improve and simplify the means for ejecting the contents and to prevent refilling of the receptacle. i

'F or further comprehension of the invention,` and of the objectsV and advantanges thereof, reference willbe had to the following description and accompanying drawings, vand to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawings, in which I have illustrated an embodiment of the invention:

Figure 1 is an axial sectional view of a grease gun embodying the invention. j

Fig. 2 is a detail horizontal section on the line 2 2 of Fig. l1. i

Fig. 3 is a detail vertical section showing the piston nut and disk, taken on the line 3-3 of Ihg. 4. I

Fig. 4 is a horizontal section on the line 4 4 of Fig. 1.

Fig. 5 is a horizontal section on the line 5 of Fig. 1. It is to be understood that in describing my device as a grease gun throughout the specification and claims, I employ this term for convenience in nomenclature and not in any way in a limiting sense.

As here shown my improved grease gun comprises a cylindrical receptacle 2 having fixed on its forward or discharge end a conical head 3 which may be secured thereto by crimping its edges over the outwardly flared end of the cylinder as indicated at 4 or by other suitable means. This head is formed with an upwardly extending, exteriorly screw-threaded neck 3 to which the discharge nozzle 5 is attached.I

The rear end of the receptacle 2 is closed by a rotatable cap 6 having a cylindrical extension 7 which projects over the rear end of the receptacle. To this cap is secured one end of a helix 8 which extends centrally through the receptacle, this helix being here formed of a pair of twisted wires whose rear ends 8r project through a suitable aperture in the cap 6 and are turned outwardly and positioned in a shallow recess in the cap 6 in which they may be secured by solder or the like, as lshown in Figs. 1 and 5.

The opposite or forward end of this helix 8 extends 'into the neck 3 and is supported 'by a cross-bar 9 mounted in said neck, as shown` in Figs. 1 and 2, the helix projecting through an aperture 10 in said cross-bar and having a washer 11 fixed on its project'- ing end, the extreme portions of the two wires forming the helix 8 being bent outwardly over the washer 11 to which they may be soldered. As will be apparent, the helix 8 is rotatably supported in the receptacle 2 and retains the cap 6 against endwise movement while permitting it to be rotated and, in turn, rotating the helix. j

Mounted on the helix is a piston or follower which is advanced by rotation of the helix to discharge the contents of the receptacle. This piston comprises a disk 12 (Figs. 1, 3 and 4) having off-set central portion 13 providing a recess in which is located a nut 14 threaded on the helix, the nut engaging the disk through the medium of a pair of laterally projecting lugs 15 on the nut which bear against the ends of tongues 16 bent downwardly from` the portion 13 of the disk.

The nut is held in position in the recess by means of a flat spring 17 which extends across the receptacle from side toside thereof and is riveted, as at 18, to the disk 12 on opposite sides of the recess. This spring 17 has a central aperture which receives a boss 19 on the under side of the nut. The end portions 17 of the spring 17 incline or bend downwardly from the rivets 18 and engage the in-` ner faces of apair of ribs 20 extending longitudinally of the receptacle on opposite sides thereof, the disk 12 being formed wlth peripheral notches 21 in. which these ribs engage and prevent rotation of the disk 12 and attached parts.

Mounted upon the upperl face of the disk 12 is a second disk 22, of paper or suitable material, this disk having a recess 23 on lts underside to receive the off-set .portlon 13 'of the disk 12. The helix passes freely assembled the disk 22 rests upon the disk 12.

The manner of use of my improved grease gun is as follows: The parts are assembled with the follower adjacent the cap 6 when the receptacle is filled. By rotating the cap 6, and with it the helix 8, the follower is caused to advance to discharge the material through the nozzle 5, nut 14 being prevented from rotation by engagement of lugs 15 with the tongues 16 on the disk 12, the disk being prevented from rotation by the ribs 20. lf the helix is rotated in an opposite direction the nut 14 will rotate with it as the lugs 15 will ride under the tongues 16. Also if any back pressure is exerted on the disk the ends 17 of the spring member 17 wedge against the ribs 20 and prevent backward movement of the disk. This prevents refilling the receptacle once it has been emptied of its original contents, which is a desirable feature in the commercial use of these devices.

l`What I claim is 1. A grease gun comprising a receptacle having a helix extending therethrough, a piston device in said receptacle comprising a disk, means preventing rotation of said disk in said receptacle, a nut threaded on the helix, and a 'connection between said disk and nut preventing relative rotation in one direction but permitting it in an opposite direction.

2. A grease gun comprising a receptacle having a helix extending therethrough, a piston device in said receptacle comprising a disk, means preventing rotation of said disk in said receptacle,'a nut threaded on the helix, and a connection. between said disk and nut preventing relative rotation in one direction but permitting it in an opposite direction, said connection being formed by a pair of tongues struck downwardly from the disk and a pair of lugs projecting from the nut adapted to engage said tongues.

3. A grease gun comprising a receptacle, a helix extending through said receptacle, a disk in said receptacle, a nut threaded on the said helix, coperating parts on said disk and nut preventing relative rotation in one direction but permitting it in an opp0- site direction, and a longitudinal feather connection between the wall .of the receptacle. and the said disk.

4. A grease gun comprising a receptacle, a helix extending through said receptacle, a disk in said receptacle, means preventing receptacle wall adapted to slide longitudinally therealong when the disk is advanced and to bind thereon to prevent retractive movement of the disk.

5. A grease gun comprising a receptacle,

a helix extending through said receptacle, a disk in said receptacle, means preventing rotation of said disk in said receptacle, a nut threaded on the said helix and adapted to advance the disk, co'perating parts on said disk and nut preventing relative r'otation in one direction but permitting it in an oppositeldirection, and a member carried by the disk in engagement with the receptacle wall adapted to slide longitudinally therealong when the disk is advanced and to bind thereon to prevent retractive movement of the disk, said member comprising a flat spring secured to the disk between its ends and having the ends thereof in engagement with the wall of the receptacle. 6. A grease gun comprising a receptacle, a helix extending through said receptacle, a disk in said receptacle, a' feather connection between said disk and the wall of the receptacle, said disk being formed with an upwardly pressed central portion forming a recess in its under side, a nut in said recess, lugs upon sai-d nut, tongues pressed downwardly from said central portion of the disk across the faces of said lugs, and a flat spring secured to the disk on opposite sides of the said recess and extending under the said nut and having its end portions inclining slightly downwardly and engaging the Wall of the said receptacle.

7. A grease gun comprising a receptacle havinga neck inclosing a discharge orifice at one end, a rotatable cap closing the opposite end of the receptacle, a helix fixed at one end to said cap and rotatably secured at its opposite end to the neck of said receptacle, a piston positioned upon said helix, and means including a flat spring operatively connected to and extending diametrically across one side of said pist-on with its ends bent slightly downwardly and engaging the side walls of said receptacle whereby said piston may be caused to ad- Avance in said receptacle when the helix is rotated in one direction and prevented from retractive movement when the helix is rotated in an opposite direction.

Signed at the city, county and State of New York, this 25 day of Sept., 1919.

JOHN G. MACGREGOR. 

